Back to EveryPatent.com
United States Patent | 5,642,210 |
Stoll ,   et al. | June 24, 1997 |
In a method for mitigating cross-talk in high-efficiency, angle-multiplexed holograms stored in photorefractive media, a plurality of uniformly low-efficiency holograms are first stored within a common holographic storage medium and then simultaneously exposed to a like plurality of mutually incoherent reference beams. Each reference beam effects enhancement of its corresponding hologram so as to increase the level thereof while also minimizing cross-talk between holograms.
Inventors: | Stoll; Harold M. (Rancho Palos Verdes, CA); Reis; James J. (San Pedro, CA) |
Assignee: | Northrop Grumman Corporation (Los Angeles, CA) |
Appl. No.: | 420939 |
Filed: | April 12, 1995 |
Current U.S. Class: | 359/10; 359/7; 359/11; 359/35 |
Intern'l Class: | G03H 001/10; G03H 001/12; G03H 001/02; G03H 001/04 |
Field of Search: | 359/10,7,29,286,11,35 |
4359259 | Nov., 1982 | Horner et al. | 359/15. |
4645300 | Feb., 1987 | Brandstetter et al. | 359/285. |
5339177 | Aug., 1994 | Jenkins et al. | 359/35. |
5440669 | Aug., 1995 | Rakuljic et al. | 359/7. |
"Multiple Storage and Erasure of Fixed Holograms in Fe-Doped LiNbO.sub.3 ", Applied Physics Letters, vol. 26, No. 4, p. 182 (1975). "Storage of 500 High-Resolution Holograms in a LiNbO.sub.3 Crystal", Optics Letters, vol. 16, No. 8, p. 605 (1991). "Theory of Optical Information Storage in Solids", Applied Optics, vol. 2, No. 4, p. 393 (1963). "Self Enhancement in Lithium Niobate", Optics Communications, vol. 72, No. 3, 4, p. 175 (1989). "Single-Step Copying Process for Multiplexed Volume Holograms", Optics Letters, vol. 17, No. 9, p. 676 (1992). |